AU668933B2 - Flat cable - Google Patents

Flat cable Download PDF

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Publication number
AU668933B2
AU668933B2 AU38950/93A AU3895093A AU668933B2 AU 668933 B2 AU668933 B2 AU 668933B2 AU 38950/93 A AU38950/93 A AU 38950/93A AU 3895093 A AU3895093 A AU 3895093A AU 668933 B2 AU668933 B2 AU 668933B2
Authority
AU
Australia
Prior art keywords
braiding
conductors
conductor
cable according
cable
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
AU38950/93A
Other versions
AU3895093A (en
Inventor
Andrea Gellan
John Norquay Kippen
David Mcnaughton
David Wood
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
WL Gore and Associates UK Ltd
Original Assignee
WL Gore and Associates UK Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to GB9207330 priority Critical
Priority to GB929207330A priority patent/GB9207330D0/en
Application filed by WL Gore and Associates UK Ltd filed Critical WL Gore and Associates UK Ltd
Priority to PCT/GB1993/000640 priority patent/WO1993020563A1/en
Publication of AU3895093A publication Critical patent/AU3895093A/en
Application granted granted Critical
Publication of AU668933B2 publication Critical patent/AU668933B2/en
Anticipated expiration legal-status Critical
Application status is Expired legal-status Critical

Links

Classifications

    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01BCABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B7/00Insulated conductors or cables characterised by their form
    • H01B7/02Disposition of insulation
    • H01B7/0241Disposition of insulation comprising one or more helical wrapped layers of insulation
    • DTEXTILES; PAPER
    • D04BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04CBRAIDING OR MANUFACTURE OF LACE, INCLUDING BOBBIN-NET OR CARBONISED LACE; BRAIDING MACHINES; BRAID; LACE
    • D04C1/00Braid or lace, e.g. pillow-lace; Processes for the manufacture thereof
    • D04C1/06Braid or lace serving particular purposes
    • D04C1/12Cords, lines, or tows
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01BCABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B7/00Insulated conductors or cables characterised by their form
    • H01B7/08Flat or ribbon cables
    • H01B7/083Parallel wires, incorporated in a fabric
    • DTEXTILES; PAPER
    • D10INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10BINDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B2321/00Fibres made from polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • D10B2321/04Fibres made from polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds polymers of halogenated hydrocarbons
    • D10B2321/042Fibres made from polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds polymers of halogenated hydrocarbons polymers of fluorinated hydrocarbons, e.g. polytetrafluoroethene [PTFE]

Description

OPI DATE 08/11/93 APPLN. ID 38950/93 1111 IIII AOJP DATE 13/01/94 PCT NUMBER PCT/GB93/00640 llillll I AU9338950 IN ItKNA I VLNAL ArrLA%_1A I IUI-4 I r

(PCT)

(51) International Patent Classification 5 International Publication Number: WO 93/20563 H01B 7/08 Al (43) International Publication Date: 14 October 1993 (14.10.93) (21) International Application Number: PCT/GB93/00640 (74) Agents: McCALLUM, William, Potter et al.; Cruikshank Fairweather, 19 Royal Exchange Sq., Glasgow GI (22) International Filing Date: 29 March 1993 (29.03.93) 3AE (GB).

Priority data: (81) Designated States: AU, CA, JP, US, European patent (AT, 9207330.3 3 April 1992 (03.04.92) GB BE, CH, DE, DK, ES, FR, GB, GR, IE, IT, LU, MC, NL, PT, SE).

(71) Applicant (for all dteignated States except US): W.L. GORE ASSOCIATES (UK) LTD. [GB/GB]; I Bell Yard, Published London WC2A 2JP With international search report.

(72) Inventors; and Inventors/Applicants (for US only) WOOD, David [GB/ GB]; 9 St. Peters Court, Inverkeithing, Fife KYI 1QA McNAUGHTON, David [GB/GB]; 3 Abbotts Wind, Kelty Bridge, Fife KY4 OJS KIPPEN, John, Norquay [GB/GB]; 178 South Street, Lochgelly, Fife 9AB GELLAN, Andrea [GB/GB]; 9 Transy Grove, Dunfermline, Fife KYI2 7QP (GB).

(54)Title: FLAT CABLE (57) Abstract 10 1112 13 A flat cable comprises a series of parallel electrical con- 1 ductors (1 to 6) each carrying a spiral-wound tape insulation layer The conductors are held together by braiding formed of a 2 plurality of tapes (10 to 22) or fibres interwoven between the con- 3 ductors. The braiding is preferably of a thermoplastic material 4 which may be heat bonded to the insulation in order to set the cable in a desired shape e.g. for a wiring loom. The insulation and braiding is preferably formed from a mixture of polytetrafluoroethylene (PTFE) and a copolymer of tetrafluoroethylene and 6 perfluoro(propylvinylether). 16 17 18 22 21 20 19 Ii WO 93/20563 PCT/GB93/00640 -1 FLAT CABLE TEC)HNICAL FIELD The present invention relates to a flat cable construction comprising a series of parallel longitudinally extending electrical conductors arranged side-by-side.

BACKGROUND OF THE INVENTION Flat cables are well known and are used in a variety of applications where multiple electrical connections are to be made between pieces of electrical equipment. The flat orientation of the conductors allows individual conductors to be readily identified when connections are being made or when end connectors are being attached.

Conventionally, flat cables are made by extruding the insulating material onto the parallel conductors.

Conventional extrusion suffers from a number of disadvantages, particularly where high performance insulation is required, e.g. in the defence industry.

Firstly, extruded flat cables are very resistant to bending in a direction parallel to the plane of the cable. This makes it difficult to form conventional flat cables into pre-configured wiring harnesses, and means that the flat cable must be routed in situ. It would be desirable to be able to produce a flat cable construction which could be bent in any direction, such as to allow the i .1 2 production of "drop-in" pre-configured wiring harnesses, particularly where it is difficult to route cables in situ due to restricted access or space limitations.

A second disadvantage is that such extruded insulation material does not necessarily give the best mechanical and electrical insulation properties. Also in order to safeguard the integrity of the insulation, the thickness of extruded insulation tends to be greater than, for example, that of tape-wound insulation. Insulating tapes can be processed, such as by pre-stretching in order to provide the desired mechanical and electrical properties.

It would therefore be desirable to provide a flat cable construction which mitigates some or all of these disadvantages.

US-A-3 582 537 discloses a woven ribbon cable wherein a woven lattice structure holds a plurality of insulated conductor wires in a given spaced parallel relationship and has its warp and weft members bonded to each other at the intersections thereof.

W091/17551 discloses an electrical insulating composite material comprising an intimate admixture of a thermoplastic copolymer of tetrafluoroethylene and perfluoro (propyl vinyl ether) and coagulated dispersion type polytetrafluoroethylene (PTFE), or of porous expanded PTFE. Tape made from the composite material may beo wrapped around a conductor and sintered to fuse the

'-I

gy

S'\

'V 0' fr S3 overlapping areas of the tape together.

US-A-3 654 381 discloses a flat cable woven with a warp consisting solely of conductors. The weft threads are woven directly into the conductors to form the final woven cable.

SUMMARY OF THE INVENTION The present invention provides a flat cable which comprises a series of parallel longitudinally extending electrical conductors or conductor groups arranged side-byside, each conductor having an electrically insulating covering, the conductors or conductor groups being held together by braiding comprising at least one thermoplastic filament interwoven between the conductors or conductor groups, characterised in that the braiding is heat-bonded to the insulating covering on the conductors.

Whilst the electrically insulating covering can be extruded onto each conductor, where thin high performance ,iinsulations are required it is preferred to wrap one or more layers of an insulating tape in a spiral manner around the conductor. Preferably, the spirally wound turns of tape overlap by up to 50% of the width of the tape in order Sto maintain integrity of the insulation. Typically, from 1 to 5, usually 2 or 3 layers of tape are applied. The tape is preferably formed from a mixture of :4 eo eo.

7~ 1 e 0 3a polytetrafluoroethylene (PTFE) and PFA copolymer of tetrafluoroethylene (TFE) and perfluoro(propylvinylether) (PPVE) as disclosed in our international application PCT/GB91/00661. In particular, it is preferred that the insulation shall be formed of alternating layers of porous expanded material and non-porous material. Such tape wrap constructions show good abrasion and cut-through resistance and good electrical insulation properties, whilst being of relatively low thickness, and thus allowing compact cable constructions.

In an alternative embodiment, the insulating tape may be a polyester film, such as Mylar (trademark), Melenex (trademark), Hostaphan (trademark) or Milene (trademark).

Such films include a polyester base film with a heat sealable thermoplastic polyester resin coating thereon which may be fused at relatively low temperatures e.g..

200-210 0 C. The insulation is formed as before by tape-wrapping the conductor and heating to adhere the tape layers.

1 $/'rQ WO 93/20563 PCT/GB93/00640 4 Typically, the cable comprises 2 to 12, typically 6, conductors. The conductors may comprise twisted pairs.

The parallel conductors are held together by braiding comprising at least one filament interwoven between the conductors. This allows the flat cable to be bent in any direction, including the direction parallel to the plane of the cable, which imparts good flexibility. It also allows the cable to be bent into a pre-configured harness configuration. Usually, the braiding will comprise a plurality of filaments, for example 2 to 25 filaments, preferably 6 to 16 filaments. Typical braiding machines apply 13 filaments.

The filaments are preferably formed of an electrically insulating material. For some applications, the braiding is formed of a plastics material which becomes bonded to the electrically insulating covering around the conductors upon the application of heat. In particular, the braiding may be formed of the same or similar material to that used for the electrical insulation the outer layer of tape-wrapped electrical insulation) around the conductors. Thus, when the insulating covering around the conductors is formed of a material comprising PTFE and TFE/PPVE copolymer as disclosed in the above mentioned international patent application, then the braiding is formed of the same or similar adherable material. The material may be bonded to itself by heating to a sintering temperature.

I: ti I f In order to provide a braiding material of high tensile strength, an expanded porous material of the type disclosed in the international patent application PCT\GB91\00661 may be used. Such porous expanded materials may have a matrix tensile strength of up to 3515 kg\cm 2 (50,000 pounds per square inch), and are preferably drawn down to form flat fibres. The matrix tensile strength is defined as the tensile strength divided by the solid volume fraction of the porous material, i.e.

TENSILE STRENGTH x 2.15;(2.15 being the SG of Solid PTFE).

DENSITY

Analogously, if a polyester insulating material is used on the conductors, the braiding is preferably formed of the same material or a similar material which can be adhered thereto under the effect of heat.

In this way, the flat cable may be bent -nto the desired three-dimensional configuration, and then heat-set by heating to a sintering or fusing temperature.

Alternatively, the braiding filaments may be in the form of fibres or round monofilaments (such as nylon or polyester).

Preferably, the filaments are interwoven by passing a filament over one conductor and under the adjacent conductor. Alternatively, groups of conductors, for example 2 to 4 conductors twisted together, may be interconnected by passing the filament over one group and under the adjacent group.

C'

I

i i WO 93/20563 PCT/GB93/00640 -6 Thus, the present .rvention allows the production of a flat cable which can be bent in any direction in three dimensions so as to allow the pre-fabrication of a routed wiring harness. The harness configuration may then be heat-set. The flat cable construction allows both flat and round terminal connectors to be used. The flat cable is simply rolled up in a transverse direction if a circular connector terminal is to be attac-.d. A reduced thickness of insulation may be used, leading to increased signal density and reduced cable weight.

PREFERRED EMBODIMENT An embodiment of the present invention will now be described by way of example only in conjunction with the drawing wherein: Figure 1 shows a flat braided cable construction.

The figure shows a flat cable comprising six parallel insulated conductors 1 to 6 which lie side-by-side in a single plane, and which are held together by thirteen strips of braiding 10 to 22 interwoven between the conductors.

Each filament of braiding is woven over one conductor and under the adjacent conductor.

Each conductor has an electrically insulating covering 30 around it. Typically, the insulated covering comprises a first layer of a spirally wound porous expanded tape; a second layer of a non-porous spirally 7 wound tape; and a third outer layer of a porous expanded spirally wound tape. The tapes are wound in overlapping (and possibly counter-rotatory) overlapping turns. The porous and non-porous tapes are typically formed of a composite material as disclosed in PCT/GB91/00661 (W091/17551). The non porous material typically comprises an intimate admixture of 5 to 40 wt.% of a thermoplastic copolymer of tetrafluoroethylene and perfluoro(propylvinylether) and 60 to 95 wt.% of coagulated dispersion type polytetrafluoroethylene, the composite material having been extruded and calendered to form a tape. The porous expanded composite material typically is formed of an intimate admixture of 50 to wt.% of a thermoplastic copolymer of tetrafluoroethylene and perfluoro(propylvinylether) and to 5 wt.% of polytetrafluoroethylene. Usually, the porous expanded material comprises 50 to 95 wt.% of copolymer.

The filaments of braiding are formed of the same porous expanded tape and have a width 2 mm and thickness 12 microns. The matrix tensile strength is 5624 to 7030 kg/cm 2 (80 to 100,000 pounds per square inch). The material .is typically formed as Example 3 of W091/17551.

The flat cable as shown in Figure 1 may then be bent to shape in any direction. Due to the fact that the conductors are held together by braiding, the conductors may move along side each other, thereby enabling the cable to be bent in a direction parallel to the plane of the flat cable. As shown in WO 93/20563 PCTIGB93/00640 8 Figure 1, in so doing the ends of the conductors become displaced longitudinally relative to one another. Once the cable has been formed into the desired configuration, it may be heat-set by sintering, typically by heat treating in air at 350°C for about 1 minute.

In an alternative embodiment six twisted pairs of insulated conductors are braided into a flat cable. The conductor insulation is a heat-sealable polyester film and the braiding is formed of the same polyester material, which is heat-settable at about 200-210oC.

Other heat-settable insulating materials may be used for the insulation and braiding, and the present invention is not limited to any particular material.

4 i

Claims (9)

1. A flat cable which comprises a series of parallel longitudinally extending electrical conductors or conductor groups arranged side-by-side, each conductor having an electrically insulating covering, the conductors or conductor groups being held together by braiding comprising at least one thermoplastic filament interwoven between the conductors or conductor groups, characterised in that the braiding is heat-bonded to the insulating covering on the conductors.
2. A cable according to claim 1 wherein the electrically insulating covering is in the form of spirally wound overlapping tape.
A cable according to claim 2 wherein the insulating covering comprises a mixture of polytetrafluoroethylene (PTFE) and a copolymer of tetrafluoroethylene (TFE) and perfluoro(propylvinylether) (PPVE)
4. A cable according to claim 3 wherein the insulating covering comprises porous and non-porous tape formed from said mixture.
5. A cable according to any preceding claim wherein the braiding filament is in the form of a tape.
6. A cable according to any of claims 1 to 4 wherein the braiding filament is in the form of a fibre or monofilament.
7. A cable according to claim 6 wheein the braiding filament is in the form of a PTFE fiber of substantially round cross-section which has been formed from a continuous sheet of PTFE which has been helically rolled and adhered to itself. i
8. A cable according to any preceding claim comprising a plurality of conductors and a plurality of braiding filaments, each filament passing over one conductor or conductor group and under an adjacent conductor or conductor group.
9. The cable substantially as described herein and as illustrated in the accompanying drawing. Dated this 28th day of February 1996 W L GORE ASSOCIATES (UK) LTD 0 By their Patent Attorneys GRIFFITH HACK CO I I r I I r II i I r I I /?d 1
AU38950/93A 1992-04-03 1993-03-29 Flat cable Expired AU668933B2 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
GB9207330 1992-04-03
GB929207330A GB9207330D0 (en) 1992-04-03 1992-04-03 Flat cable
PCT/GB1993/000640 WO1993020563A1 (en) 1992-04-03 1993-03-29 Flat cable

Publications (2)

Publication Number Publication Date
AU3895093A AU3895093A (en) 1993-11-08
AU668933B2 true AU668933B2 (en) 1996-05-23

Family

ID=10713406

Family Applications (1)

Application Number Title Priority Date Filing Date
AU38950/93A Expired AU668933B2 (en) 1992-04-03 1993-03-29 Flat cable

Country Status (9)

Country Link
US (1) US5635677A (en)
EP (1) EP0634046B1 (en)
JP (1) JP3537818B2 (en)
AU (1) AU668933B2 (en)
CA (1) CA2132980C (en)
DE (2) DE69302471T2 (en)
ES (1) ES2087731T3 (en)
GB (1) GB9207330D0 (en)
WO (1) WO1993020563A1 (en)

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Publication number Priority date Publication date Assignee Title
GB9713105D0 (en) * 1997-06-20 1997-08-27 Ixos Limited An electrical cable and method of manufacturing the same
EP1012855B1 (en) 1997-06-20 2001-04-04 Ixos Limited An electrical cable and method of manufacturing the same
FR2776135B1 (en) * 1998-03-11 2000-05-19 Novoplastic Sa Conduit associated with an electric detection conductor, for example for pulling or pushing a cable
US6296725B1 (en) 1998-09-29 2001-10-02 Litton Systems, Inc. High frequency ribbon cable for twist capsule cable applications
US6412386B1 (en) * 2001-03-14 2002-07-02 Tony Tseng Braided ribbon and its fabrication method
US20040214454A1 (en) * 2002-01-15 2004-10-28 Tribotek, Inc. Method and apparatus for manufacturing woven connectors
US6951465B2 (en) * 2002-01-15 2005-10-04 Tribotek, Inc. Multiple-contact woven power connectors
US6945790B2 (en) * 2002-01-15 2005-09-20 Tribotek, Inc. Multiple-contact cable connector assemblies
US7083427B2 (en) * 2002-01-15 2006-08-01 Tribotek, Inc. Woven multiple-contact connectors
US7056139B2 (en) * 2002-01-15 2006-06-06 Tribotek, Inc. Electrical connector
CN100452556C (en) * 2002-01-15 2009-01-14 翠伯泰克有限公司 Woven multiple-contact connector
US7077662B2 (en) * 2002-01-15 2006-07-18 Tribotek, Inc. Contact woven connectors
JP2007529089A (en) * 2003-07-11 2007-10-18 トライボテック,インコーポレイテッド Multi-contact woven electrical switch
US7097495B2 (en) * 2003-07-14 2006-08-29 Tribotek, Inc. System and methods for connecting electrical components
EP1661947B1 (en) * 2003-08-25 2016-05-11 Daikin Industries, Ltd. Product for high-frequency signal transmission, process for producing the same and high-frequency transmission cable
DE202004016182U1 (en) * 2004-10-18 2006-03-23 Igus Gmbh Flexible power cable
US7140916B2 (en) * 2005-03-15 2006-11-28 Tribotek, Inc. Electrical connector having one or more electrical contact points
US7214106B2 (en) * 2005-07-18 2007-05-08 Tribotek, Inc. Electrical connector
US8816208B2 (en) * 2010-09-30 2014-08-26 Hitachi Metals, Ltd. Flat cable and cable harness using the same
JP2013054991A (en) * 2011-09-06 2013-03-21 Hitachi Cable Fine Tech Ltd Flat cable and cable harness including the same
JP2013058448A (en) 2011-09-09 2013-03-28 Hitachi Cable Fine Tech Ltd Shielded flat cable and cable harness using the same
JP2013062065A (en) * 2011-09-12 2013-04-04 Hitachi Cable Fine Tech Ltd Flat cable and cable harness using the same
US9330815B2 (en) 2013-08-14 2016-05-03 Apple Inc. Cable structures with insulating tape and systems and methods for making the same
WO2018203357A1 (en) * 2017-05-03 2018-11-08 Elexa Cavi S.R.L. Flat cable with braided harness for electrotechnical and electronical use

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US5075514A (en) * 1990-08-14 1991-12-24 Thermex, Inc. Insulated thermocouple

Also Published As

Publication number Publication date
US5635677A (en) 1997-06-03
CA2132980A1 (en) 1993-10-14
WO1993020563A1 (en) 1993-10-14
JPH07505498A (en) 1995-06-15
EP0634046A1 (en) 1995-01-18
DE69302471T2 (en) 1996-09-05
ES2087731T3 (en) 1996-07-16
EP0634046B1 (en) 1996-05-01
AU3895093A (en) 1993-11-08
DE69302471D1 (en) 1996-06-05
JP3537818B2 (en) 2004-06-14
GB9207330D0 (en) 1992-05-13
CA2132980C (en) 2002-05-21

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